Okay, I'm on the sixth quest of the Thieves Guild, Speaking with Silence, and I'm outside the door to the Sanctum that requires a Golden Claw to enter. I've found out that Mercer is supposed to open it for me like he did the outer door, but the programming on Mercer is so bad he won't open up the door for me. He wouldn't even walk near the door until I pushed him over there. Any idea what to do?

EDIT: Oh, and found another glitch where I can push him through a metal wall and him still not open the door. Normally after a few seconds he just pops back out again on my side.